Issue with scheduled call retries from HubSpot → Retell (fails on later attempts)

Support Help
1

Hi everyone, I’m running into an issue with automated call retries between HubSpot and Retell, and I’d appreciate any help or guidance.

Here’s my setup:

  • I’m using a HubSpot workflow with a webhook to trigger outbound calls via Retell.

  • Calls are scheduled as retries when a previous attempt fails:

    • 1st retry → after 30 minutes

    • 2nd retry → after 3 hours

    • 3rd retry → next day at 10:00 AM

Problem:

  • The first and second retries usually work fine.

  • The third retry frequently fails.

  • In HubSpot logs, I get this error:
    “No response received from the connected application”

  • The response does not return a clear JSON error or reason.

Additional context:

  • I’m using Retell integrated with Zadarma for telephony.

  • The workflow executes correctly, but HubSpot seems unable to complete the call action on later retries.

  • There’s no clear failure reason in the webhook response.

What I’d like to understand:

  • Could this be related to:

    • Expired session / token in Retell?

    • Rate limits or retry limits?

    • Zadarma restrictions on delayed calls?

    • HubSpot webhook timeout or retry behavior?

If anyone has experienced something similar or has suggestions on how to debug this (logs, headers, retries, etc.), I’d really appreciate your help.

Thanks in advance :raising_hands:

2

Hello @contacto

Could you please share a bit more detail such as a few call IDs or any relevant examples so we can investigate the issue more effectively?

Thank you!